Movable support for expansion-flues



(No Model.)

- SPA. GRIGGS.

MOVABLE SUPPORT FOR EXPANSIU N FLUES. S

No. 552,525. Patented Jan. 7, 1896.

M INVENTOR wza WITNESSES UNITED STATES PATENT OFFICE.

STEPHEN A. GRIGGS, QF DETROIT, MICHIGAN.

MOVABLE SUPPORT FOR EXPANSlON-FLUES.

SPECIFICATION forming part of Letters Patent No. 552,525,.dated January 7, 1896.

Application filed 1111 22, 1895. $erial N0. 3,750. (No model.)

To all whom it may concern.-

Be it known that I, STEPHEN A. GRIGGS, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Movable Supports for Expan sion-Flues; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

The object of my invention is to provide a movable support for those portions of a boiler, furnace, or other heating device subject to expansion and contraction. In heating devices it is frequently of advantage to have the combustion-chamber of such great length that the element of expansion and contraction becomes material and a source of destruction and danger. WVhere the furnace is set in brickwork and fixed at both ends, the expansion loosens the brickwork. In all cases where return-flues are used on heating devices, particularly hot-air heaters, the fiues are preferably made of light iron, and when confined at both ends are sure to buckle up when expanded by heat, and frequently pull apart when contracted. The device used by me to accomplish the result aimed at is shown in the accompanying drawings, in which Figure 1 is a perspective of a horizontal hot-air furnace. Fig. 2 is a vertical sectional View of the ends of the return-fines and their support, with the front of the furnace removed. I

In the drawings, A is the body of the furnace, supported at the forward end of the ash-pit A.

B is the front of the furnace.

C C are the rear legs of the furnace, provided with shoes 0 c.

D is a fl00r-plate provided with grooves cl cl. In these grooves are balls (1 d, upon which the feet rest and on which the rear end of the furnace is supported.

E is a fixed head above and connected with the rear end of the furnace.

F F are .fiues connected with the head E and extended forward over the boiler, where they are connected at the forward end with the movable head G.

H is a return-flue from the head G to the head E.

K is a support bolted to the forward end of the furnace above the fire-door, and is provided with grooves 7c, in which are the balls k 70. These balls support the movable head G.

The products of combustion pass through the combustion-chamber of the furnace into the fixed head E, forward through the fines F to the head G, and back through the return-flue H.

My invention consists of the movable supports for the rear end of the furnace and for the movable head G. The supports for the rear of the furnace allow for the expansion of the combustion-chamber, and the supports for the head G allow for the expansion of the flues.

What I claim is- In a heating furnace, the combination of the body, having a movable support for the rear end of the body, return fiues having a fixed support on the body, the support K, the flue head G, and anti-friction bearing between the support K, and the head G substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

STEPHEN A. GRIGGS. Witnesses O. H. FIsK, G. M. DAVIS. 

